M42740M4-02 02/10/08 page 30
ROOM AIR TREATMENT COIL
ATTENTION: accidental contact with the fins of the exchanger may cause small cuts. When performing the following steps,
use protective gloves.
The finned surfaces of the cooling coils and especially the condensation collection trays are the places where micro-organisms
and moulds most easily flourish. It is therefore very important to clean regularly with suitable detergents and disinfect with
appropriate products as necessary.
STRUCTURE
Check the condition of the parts making up the structure.
Paint so as to eliminate or reduce oxidation at the points in the unit where this problem may occur. Check that the panelling is
fastened correctly. Poor fastening may give rise to malfunctions and abnormal noise and vibration.
DUCTING
Check the fixing screws and the operation of the anti-vibration devices in order to prevent the transmission of vibrations in the room.
FANS WITH BELT DRIVE
BELT
The tension of the belt can be adjusted by the worm screw
on the slide connected to the electric motor, using a
socket wrench or spanner. The belt is tensioned correctly
when the tolerances defined in the enclosed sketch are
respected. The tension of the belt should be checked after
around 10 hours of operation.
Avoid the following situations:
1. Not sufficient tension, which causes slipping and
overheating and, as a consequence, the reduction of
service life.
2. Too much high tension, which subjects the belt to
high stresses and, as a consequence, the reduction
of unit life and an excessive stress on bearings and
supports.
3. Belt lifted from the groove
4. Belt that reaches the bottom of the groove.
5. Belts of different length (only in the case of coupled
belts).
PULLEYS
Avoid the following situations:
1. Pulleys not aligned.
2. Pulleys not parallel.
3. dirty pulleys; dust, grease, dirt deposited
between the surfaces of the belt and of the
pulleys can make the system operate in
anomalous conditions.
4. Pulleys not straight.
5. Pulleys too small.
6. Pulleys broken.
7. Pulleys off-centre or unstable.
8. Pulleys worn.
L = distance between pulleys
F = belt profile force SPA 2,8..3,6 Kg
D = elastic deviation = L x 0,0015
ELECTRIC MOTOR
The cooling air slits must be always free to let the air
pass.
ANTIVIBRATION RUBBERS
Periodically check the condition to avoid situations of
anomalous vibrations / noise.
BEARINGS
Check regularly if unusual noises are presents.
High size fans are equipped with grease nipples where grease
for bearings must be periodically added.
ELECTRICAL HEATING ELEMENTS
The convector finned heating elements need to be checked regularly to ensure that they are clean and properly fastened to the
support.
A
1
2
3
3
(A) STANDARD UNIT
(1) HEATING ELEMENTS
(2) ELECTRICAL PANEL OF THE RESISTANCE
MANAGEMENT
(3) AIR FLOW DIRECTION
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